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Classifications

B—PERFORMING OPERATIONS; TRANSPORTING

B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS

B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM In this subclass the COPES System is used

B41N3/00—Preparing for use and conserving printing surfaces

B41N3/08—Damping; Neutralising or similar differentiation treatments for lithographic printing formes; Gumming or finishing solutions, fountain solutions, correction or deletion fluids, or on-press development

Das eingesetzte Gemisch könnte als eine "Einbrenngummierung" oder als ein "Einbrennkonservierungsmittel" bezeichnet werden, da es sowohl als "Einbrennhilfe" als auch als "Gummierung" wirkt. The mixture used could be considered a "gumming" or referred to as a "Einbrennkonservierungsmittel" because it acts both as "Einbrennhilfe" as well as "rubber".

Durch die Entwicklung werden die vom Licht getroffenen Anteile der Reproduktionsschicht entfernt, und es bleiben die unbelichteten Teile als Bildstellen auf dem Trägermaterial zurück, so daß eine der Vorlage entsprechende Druckschablone erhalten wird. By developing the proportions struck by the light of the reproduction layer to be removed, and there remain the unexposed portions as the image sites on the support material back, so that the original is obtained corresponding printing stencil.Von einer so hergestellten Druckform können in einer Druckmaschine etwa 50.000 einwandfreie Drucke erhalten werden. From a printing form thus prepared about 50,000 satisfactory prints can be obtained in a printing machine.Um ein Mehrfaches dieser Auflagenhöhe zu erreichen, muß die Druckplatte noch in an sich bekannter Weise eingebrannt werden. In order to achieve a multiple of this number of copies, the printing plate must be burned itself in a conventional manner.Zu diesem Zweck wird die belichtete und entwickelte Druckplatte mit Hilfe eines Tampons mit der folgenden Lösung überwischt und trockengerieben, wobei man darauf achtet, daß ein über die gesamte Oberfläche der Druckform zusammenhängender Film gebildet wird. To this end, the exposed and developed printing plate is wiped over with the help of a tampon with the following solution and rubbed dry, care being taken, that a continuous over the entire surface of the printing plate film is formed.

2,00 Gew.-Teile 2.00 parts by weight

N-Polyvinylpyrrolidon-(2), N-polyvinylpyrrolidone (2),

10,00 Gew.-Teile 10.00 parts by weight

Na-benzol-1,3-disulfonat, Na-benzene-1,3-disulfonate,

4,00 Gew.-Teile 4.00 parts by weight

Trikaliumcitrat · H₂O, Tripotassium · H₂O,

1,10 Gew.-Teile 1.10 parts by weight

Citronensäure · H₂O, Citric acid · H₂O,

1,50 Gew.-Teile 1.50 parts by weight

Hexandiol-(1,6), Hexanediol- (1,6),

81,40 Gew.-Teile 81.40 parts by weight

H₂O dest. H₂O least.

Anschließend wird die mit der Schutzschicht versehene Druckform während 5 min bei 240 °C in einem handelsüblichen Heißluftofen eingebrannt. Subsequently, the protective layer provided with the printing form during 5 minutes at 240 ° C is baked in a commercial hot air oven.Die so hergestellte Druckform kann sofort in die Druckmaschine eingespannt und dem üblichen Druckvorgang unterworfen werden, ohne daß es erforderlich ist, die Schutzschicht vorher mit Wasser zu entfernen und/oder die Druckformgegebenenfalls erneut mit einem Konservierungsmittel, wie beispielsweise Gummi arabicum, zu behandeln. The printing plate thus prepared can be clamped into the printing machine and subjected to the usual printing operation immediately, without it being necessary to remove the protective layer before with water and / or to treat the printing form Optionally again with a preservative, such as gum arabic.Bereits nach 6 bis 7 Umläufen der Feucht- und Farbwalzen der Druckmaschine wird eine vollständige Farbannahme der Druckschablone bei gleichzeitiger Tonfreiheit des Hintergrundes erreicht, so daß nach spätestens 10 Bogen Papier ("Makulatur") ein einwandfreier Druck erhalten wird. After 6 to 7 revolutions of the dampening and inking rollers of the printing press a full ink acceptance of the printing stencil is achieved at the same time from tone of the background, so that after 10 sheets of paper ( "waste") is obtained a perfect pressure.

Es wird folgende Einbrenngummierung eingesetzt: It is used following burn:

1,5 Gew.-Teile 1.5 parts by weight

Polyvinylmethylphosphinsäure, polyvinylmethylphosphinic,

12,0 Gew.-Teile 12.0 parts by weight

Di-Na-benzol-1,3-disulfonat, Di-Na-benzene-1,3-disulfonate,

85,5 Gew.-Teile 85.5 parts by weight

H₂O dest. H₂O least.

Claims (11)

Burning-in gum for irradiated and developed offset-printing plates, which contains a) water, b) at least one hydrophilic polymer and c) at least one component derived from an organic acid, wherein component c) comprises at least one water-soluble organic carboxylic, sulfonic, or phosphonic acid having at least two acid functions and being selected from the group consisting of benzene carboxylic acids, benzene sulfonic acids, benzene phosphonic acids, and alkane phosphonic acids, or one of the water-soluble salts of these acids.

A burning-in gum as claimed in claim 1, wherein component c) comprises a benzene disulfonic acid, a benzene polycarboxylic acid having from 3 to 6 carboxyl groups, a C₁ to C₃ alkane diphosphonic acid, a carboxyl-group-containing C₅ to C₉ alkane diphosphonic acid, and/or one of the water-soluble salts of these acids.

A burning-in gum as claimed in any of claims 1 to 4, which comprises from 1 to 50% by weight of the sum of components b) and c).

A burning-in gum as claimed in claim 5, which contains components b) and c) in a weight ratio from 1:1 to 1:20.

A burning-in gum as claimed in any of claims 1 to 6, which additionally contains a hydroxypolycarboxylic acid and/or the water-soluble salts thereof.

A burning-in gum as claimed in any of claims 1 to 7, which additionally contains a water-soluble alkanediol having at least 4 carbon atoms.

A burning-in gum as claimed in any of claims 1 to 8, wherein the offset-printing plate has a mechanically, chemically and/or electrochemically roughened and optionally anodically oxidized support material of aluminum or an aluminum alloy.

A burning-in gum as claimed in any of claims 1 to 9, wherein the offset-printing plate, prior to irradiation and development, is provided on at least one of the surfaces of its support material with an overall coating of a positive-working reproduction layer containing 1,2-naphthoquinone diazide.

Process for the production of an offset-printing forme, comprising the basic working steps of irradiating, developing, and burning-in an offset-printing plate, wherein the offset-printing plate, after development and prior to burning-in, is treated with a burning-in gum as claimed in claim 1.

EP198501027801984-03-221985-03-12Burning-in and gumming for lithographic plates, and process for the preparation of a lithograhic plate
Expired - LifetimeEP0155620B1
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